Afton, MN 55001 Frost Dates
Frost dates for Afton, MN, ZIP 55001
Around 04/22 is the usual last spring frost, about 237 days away. The first fall frost typically arrives around 10/19, about 178 frost-free days later.
Afton sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 5a around Afton has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Afton's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Afton compares
At roughly 178 frost-free days, Afton places 25,726 of 40,283 ZIP codes in this dataset. Within MN, it ranks 10 of 943.
Learn more
zone vs. frost date explains why Zone 5a and Afton's frost date answer different questions, and the frost range explains how to read the range around Afton's dates instead of trusting one.